Alonso Álvarez de Toledo y Cabeza de Vaca, 11th Marquess of Valdueza (1 October 1903 – 28 August 1987) was a Spanish peer and dog breeder.
[1][2] Known to have created his own breed of scent hounds which carry his name, "perro montero Valdueza",[3] he was a recognised hunter and one of the founding fathers of the Junta de Homologación as well as a board member of the International Council for Game and Wildlife Conservation and member of the Shikar Club.
Álvarez de Toledo inherited the Marquessate of Valdueza and the Viscountcy of la Armería in 1951.
He succeeded his father as Marquess of Valdueza and his brother Mariano as Viscount of la Armería when the latter died prematurely.
He married María del Pilar de Urquijo y Landecho, daughter of the 1st Marquess of Bolarque, 10 October 1930 at San Fermín de los Navarros in Madrid.